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Both normal and relaxed constexpr are required by our new minimum of
C++17.
Change-Id: Ic028b88a2e7a6cb7d5925f3133b9d54859a81744
Reviewed-by: Sona Kurazyan <sona.kurazyan@qt.io>
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Applied to headers only. Source file to be changed separately.
Omitted statemachine for now to avoid conflicts.
Omitted qmetatype.h for now - to be handled later.
Task-number: QTBUG-84469
Change-Id: I317376037a62467c313467d92955ad0b7473aa97
Reviewed-by: Sona Kurazyan <sona.kurazyan@qt.io>
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Conflicts:
src/plugins/platforms/xcb/qxcbdrag.cpp
Change-Id: I0b47324b70b0b4894e54b21aa3e7a5041f9bd5e3
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Constantly re-reading the timezone information only to be told the exact
same thing is wildly expensive, which can hurt in operations that cause
a lot of QTimeZone creation, for example, V4's DateObject - which
creates them a lot (in DaylightSavingTA).
This performance problem was identified when I noticed that a
QDateTime binding updated once per frame was causing >100% CPU usage
(on a desktop!) thanks to a QtQuickControls 1 Calendar (which has a
number of bindings to the date's properties like getMonth() and so
on).
The newly added tst_QTimeZone::systemTimeZone benchmark gets a ~90%
decrease in instruction count:
--- before
+++ after
PASS : tst_QTimeZone::systemTimeZone()
RESULT : tst_QTimeZone::systemTimeZone():
- 0.024 msecs per iteration (total: 51, iterations: 2048)
+ 0.0036 msecs per iteration (total: 59, iterations: 16384)
Also impacted (over in QDateTime) is
tst_QDateTime::setMSecsSinceEpochTz(). The results here are - on the
surface - less impressive (~0.17% drop), however, it isn't even
creating QTimeZone on a hot path to begin with, so a large drop would
have been a surprise.
Added several further benchmarks to cover non-system zones and
traverse transitions.
Done-With: Edward Welbourne <edward.welbourne@qt.io>
Task-number: QTBUG-75585
Change-Id: I044a84fc2d3a2dc965f63cd3a3299fc509750bf7
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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We presently only support the UTC-based offset timezones that are
listed in the CLDR; and it doesn't make sense to list more than these
in the list of available zones. However, if someone sets their TZ
environment variable to a conformant UTC-offset string, we should make
sense of it even if CLDR doesn't mention it. Only do so as final
fall-back, as backends may handle the givne name better (some such IDs
appear in the windows-compatibility list, for example).
Added tests for the new UTC-offset time-zone names.
Removed one test that relied on them not being supported.
[ChangeLog][QtCore][QTimeZone] The constructor can now handle general
UTC-offset zone names. The reported id() of such a zone shall be in
canonical form, so might not match the ID passed to the constructor.
Fixes: QTBUG-77738
Change-Id: I9a0aa68281a345c4717915c8a8fbc2978490d0aa
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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We'll be adding calendar code here as well, and tools/ was getting
rather crowded, so it looks like time to move out a reasonably
coherent sub-bundle of it all.
Change-Id: I7e8030f38c31aa307f519dd918a43fc44baa6aa1
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
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